In AR drums the presets are available from a drop down so there's no way to specify where they get stored. I've searched my system using one of the default preset names in the hope of finding the location but nothing showed up, they might go by different names behind the scenes.
I also tried pulling a song from backup, hoping that the presets were somehow stored with that instance of the VST but no joy, I just got the defaults. I searched the manual, which tells you how to create presets but not where they're stored. Then I found this on another forum:
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All presets in Drummer series are stored in NKA text files which should be located in:
%LOCALAPPDATA%\<whatever> Drummer\Data\
On Windows Vista/7/8, just press Win+R and type %LOCALAPPDATA% then Enter, and you should see Drummer folder(s) with your stored presets there.
Edit: some libraries seem to store this in your Documents folder, so:
%USERPROFILE%\Documents\<library name>\Data\
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However, I couldn't find them in either location :) I'm OK about losing them this time but I don't want to go through it all again. So - I'm still no wiser, let me know if you find any useful info.
rev